Stone geology — definition of natural bed and occurrence in rock types Which statement(s) correctly describe the “natural bed” of a stone and its relation to different rock classes?

Introduction / Context:
In construction stone selection, the “natural bed” influences how blocks should be laid for durability and load-bearing. Understanding bedding planes and anisotropy helps prevent delamination and weathering failures.

Given Data / Assumptions:

• Sedimentary rocks form by deposition in layers, producing clear bedding.
• Igneous rocks solidify from magma; many have massive textures without uniform bedding.
• Quarrying reveals planes along which stones can split.

Concept / Approach:
The natural bed is the inherent plane of weakness or layering direction in a stone. In sedimentary rocks (sandstone, limestone), this aligns with stratification. Igneous rocks like granite are typically massive; although they may have joints, a single “natural bed” is not uniformly defined.

Step-by-Step Solution:

Verification / Alternative check:
Stone masonry guidelines recommend laying sedimentary stones so the bedding plane is horizontal (as found in nature) to enhance durability under load and moisture cycles.

Why Other Options Are Wrong:

• Since A–C are correct, D (“All of the above”) is appropriate.

Common Pitfalls:
Laying bedded stones on edge increases the risk of delamination. Do not confuse jointing in igneous rocks with sedimentary bedding planes.

Final Answer: